Commentary by Pigini

Digital Modeling in Insulation System Design

December 15, 2018 • ARTICLE ARCHIVE, Commentary by PiginiComments (0)

Given the evolution in computing power and specialized software, finite element analysis (FEA) has evolved from what used to be a mainly academic pursuit into a much-used tool for product development. Engineering simulation technology, for example, now allows detailed analysis of different configurations of complex power sub-systems operating across many...

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Designing for Reliability Versus Resilience

October 13, 2018 • ARTICLE ARCHIVE, Commentary by Pigini

Projections on climate change confirm that power systems will be exposed to increasing threats of the type that jeopardize continuity and quality of supply. An example was the complete collapse of the transmission grid in Puerto Rico after a powerful... Read More

Revising IEC 60815

October 13, 2018 • ARTICLE ARCHIVE, Commentary by Pigini, Editorial Columns

Specifications contained in IEC 60815 “Selection and dimensioning of high-voltage insulators intended for use in polluted conditions” are the result of work going back to 2000 when international experts in WG11 first started to set up the documents. With... Read More

External Insulation Under Composite AC Plus DC Voltages

September 22, 2018 • ARTICLE ARCHIVE, Commentary by Pigini

Growing interest in parallel routing of AC and DC circuits on the same towers of what are referred to as ‘hybrid overhead lines’ could cause both AC and DC voltage components (known as composite voltages) to appear on line insulators. Up to now,... Read More

Dielectric Strength & Air Density

July 21, 2018 • ARTICLE ARCHIVE, Commentary by Pigini

While a number of atmospheric parameters can affect the dielectric strength of external insulation, relative air density (δ) and absolute humidity are considered the most significant. Here, I will focus on the former, which plays a key role in developing... Read More

‘Externalities’ of Overhead Power Lines

July 21, 2018 • ARTICLE ARCHIVE, Commentary by Pigini

Public opposition and growing environmental awareness now make identifying corridors for new overhead lines an increasingly complex process – especially near densely populated or sensitive areas. Given this, it has become important to examine methodologies... Read More

Composite Insulators for DC

June 28, 2018 • ARTICLE ARCHIVE, Commentary by Pigini

The world’s first DC lines were equipped with basically the same ceramic insulators used for AC. However, experience showed that, after only several years of service, there were problems with unacceptably high rates of puncture of porcelain and shattering... Read More

Corona Shielding for HVDC Line Insulators

June 16, 2018 • ARTICLE ARCHIVE, Commentary by Pigini, Corona

Power utilities and insulator manufacturers continue to express differing views as to the relative value of shielding electrodes in DC. Back in 1972, significant laboratory research had already been undertaken on the influence of shielding and grading... Read More

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